مرکز منطقه ای اطلاع رساني علوم و فناوري - Morphogenetic, Ontogenetic and Diurnal Variabilities of Turkish Oil-Bearing Rose (Rosa damascena Mill.)

Abstract :

Morphogenetic, ontogenetic and diurnal variabilities for essential oil content and components of oil-bearing rose (Rosa damascena Mill.) were studied in this research at the Süleyman Demirel University, Rose and Rose Products Research and Implementation Center in 2009. The flowers were hand-collected at five different development stages (from budding to full-flowering), four different times of the peak flowering date (06:00, 10:00, 14:00 and 18:00 h) (1st June) and four dates during the flowering season (25th May, 1st June, 8th June and 15th June), and separated in topetals and sepals for analyses of essential oil content by hydro-distillation with a Clevenger-type apparatus and components by GC/MS. The essential oil contents of the petals and sepals were 0,057% and 0,013%, respectively, while the whole flowers contained 0,035%. The petal oils had more monoterpenes geraniol (36,9%), citronellol (26,7%) and nerol (14,9%), and less methyl eugenol (0,4%). The flowers contained the highest essential oil (0,045%) when the petals were with cup-shaped and the stamens bright-yellow as group stage 4. During the flowering season for 4 weeks, the highest essential oil content (0,045%) was in the third week, the highest geraniol content (42,4%) was in the first week, and the highest citronellol content (37,7%) was in the last week. From 06:00 to18:00 h during the day, the essential oil content decreased from 0,055% to 0,017%, and also the rates of citronellol (up to 14:00 h) and methyl eugenol decreased and the rates of geraniol and nerol increased.